LCM and GCD calculator

Calculate the least common multiple (LCM) and greatest common divisor (GCD) of two numbers.

LCM

GCD6

How the calculation works

The GCD is the largest number dividing both (Euclid's algorithm). The LCM comes from LCM × GCD = A × B, so LCM = A × B / GCD.

What is the LCM for?

It is widely used to add fractions with different denominators.

Solve quadratic equations (ax² + bx + c = 0) with the delta and roots step by step.

Updated on June 17, 2026 · by Rafael Rossi · Methodology & sources